Thermal Conductivity

• Gelled Graphite/Gelatin Composites for Latent Heat Cold Storage

  Aqueous suspensions of graphite were shape stabilized by the additions of collagen and characterized as phase change materials for cold storage with enhanced thermal conductivity. Collagen addition...

• Chemical Retreating for Gel-typed Aerogel and Insulation Performance of Cement Containing Aerogel

  This research identified the possibility of application as an insulation building material by mixing aerogels with the cement paste as well as their thermal performance. The aerogel is a very...

• Enhanced Performance of Dispenser Printed MA n-type Bi2Te3 Composite Thermoelectric Generators

  This work presents performance advancements of dispenser printed composite thermoelectric materials and devices. Dispenser printed thick films allow for low-cost and scalable manufacturing of...

• Cellular PCM/Graphite Composites with Improved Thermal and Electrical Response

  This work describes the preparation of cellular graphite/paraffin composites by a facile emulsification-based method.  Graphite is readily dispersed in starch aqueous suspension and this readily...

• Effect of Varying Thermal Conductivity on Heat Conduction Through a Physical Model of a Hydride Bed

  This paper investigates the effect of implementing a varying effective thermal conductivity term on heat transfer simulations within a metal hydride (MH) reactor. The work presented utilises a 1D...

• Thermal Conductivity of PCMs for Thermal Storage Applications

  Phase change materials (PCM) including paraffins are good candidates forlatent heat thermal storage applications. Heat capacity and thermal conductivity (TC) are materials’ main characteristics...

• Thermal Conductivity Characterization of Fruits and Honey

  In the paper we present the thermal conductivity data on selected foodstuffs, e.g. fruits and honey. We demonstrate the modified transient plain source (MTPS) technique’s application in the food...

• Research Poster: Thermal Conductivity Characterization of Phase Change Materials

  Phase change materials (PCMs), such as parafin wax, are good candidates for latent heat thermal storage applications. Heat capacity and thermal conductivity (TC) are the main characteristics that...

• Research Poster: Thermal Conductivity Characterization of Transformer Liquids

  The thermal conductivity of three commercial grade transformer liquids of different composition (isoparaffinic and naphthenic) were investigated. The measured thermal conductivity values show...

• Investigation of Expandable Polymeric Microspheres for Packaging Applications

  This report documents an investigation of the feasibility of incorporating expandable polymeric microspheres into polyolefin films for food packaging applications and the ability of
  the...

• Structure and Properties of a Non-traditional Glass Containing TeO2, SeO2 and MoO3

  A glass containing SeO₂, TeO₂, MoO₃ and La₂O₃ was obtained at high oxygen pressure (P = 36 MPa) using pure oxides as precursors. The real bulk chemical composition of the glass according to...

• Study of Different Grouting Materials Used in Vertical Geothermal Closed-loop Heat Exchangers

  As a renewable source, low-enthalpy geothermal energy is becoming more relevant in heating and cooling buildings, by using an adapted heat pump to exchange thermal energy with the ground. Vertical...

• Fabrication and Characterization of Functionally Graded Synthetic Graphite/Phenolic Nanocomposites

  Stepwise functionally graded synthetic graphite/phenolic nanocomposites (FGNs) were fabricated using combined powder stacking and compression molding techniques. The process allowed the fabrication...

• Effect of Compositional Gradient on Thermal Behavior of Synthetic Graphite-Phenolic Nanocomposites

  Synthetic graphite–phenolic nanocomposites were designed and synthesized with a compositional gradient which is shown to influence transient temperature fields during rapid temperature changes....

• Enhancing Phase Change Materials: Webinar Presentation

  The thermal conductivity of phase change materials (PCMs) is an important characteristic of the material as high heat transfer rates are highly desirable.  Learn more about research recently...

• Performance of Composite Phase Change Materials Loading xGnP

  The building sector is known to make a large contribution to total energy consumption and CO2 emissions.  Phase change materials (PCMs) have been considered for thermal energy storage in...

• Performance of Exfoliated Graphite Nanoplatelets for Pollutant Reduction Rate on Wood Panel

  Exfoliated graphite nanoplatelets have been used as an additive for the improvement of a variety of properties. Nowadays, it is used as an adsorbent for pollutants, especially volatile organic...

• Chinese TCi presentation (中文TCi介绍）

  了解C-Therm TCi 导热系数仪的原理和性能。 这个Webinar详细的向大家介绍了改良瞬态平面热源法（单面）的技术优越性和局限性，以及和其他传统导热技术的比较。TCi可提供快速，简单，无损的热传导测试。专门为实验室，质量检测和生产环境所量身定做。TCi是出场校对，这使用户可以和每一次测试前繁琐的校对过程说再见。同时TCi可提供一个非常灵活的测试范围，0.028 ～ 100 W/mK...

• Novel Carbon Materials for Thermal Energy Harvesting

  An increase in population and demand for a more energy intensive standard of living has strained the global energy supply. To decrease the consumption of limited fossil fuels, research has been...

• Transient Temperature Distribution in Functionally Graded GraphitePolymer Nanocomposites

  Transient heat conduction in a functionally graded graphite/polymer nanocomposite (FGN) plate is analyzed using finite element method (FEM). Stepwise gradient structure consisted of four different...

• Building material thermal conductivity measurement and correlation with HFM, LF & TCi

  The most important factor in the worldwide problem of global warming is the emission of carbon dioxide. The 23% of carbon dioxide emissions generated by building construction must be reduced....

• Transient Temperature Distribution in Functionally Graded GraphitePolymer Nanocomposites

  Transient heat conduction in a functionally graded graphite/polymer nanocomposite (FGN) plate is analyzed using finite element method (FEM). Stepwise gradient structure consisted of four different...

• Novel Carbon Materials for Thermal Energy Harvesting

  An increase in population and demand for a more energy intensive standard of living has strained the global energy supply. To decrease the consumption of limited fossil fuels, research has been...

• Thermal Conductivity Testing of Energetic Emulsions

  Guest Speakers: Shanti Singh (R) and Sandra Golthorp (L) from the Canadian Explosives Laboratory, Natural Resources Canada (NRC)

  Description: June 2008 - This presentation is co-presented with...

• Lubricant Systems Based on Ratios of Mg. St Polymorphs

  Magnesium Stearate is a common lubricant used in the Pharmaceutical industry, as it plays a significant role in the processablity of solid dosage formulations. Commercially available Magnesium...

• Thermal Conductivity Made Easy: Introduction to the TCi

  Learn about the basics of operation to the C-Therm TCi Thermal Conductivity Analyzer. The TCi offers rapid, non-destructive thermal conductivity testing capability. Designed for lab, quality...

• TCi’s Application in the Thermal Conductivity Characterization of Nanomaterials

  Nanomaterials are an exciting area of material science research and engineering. Nanomaterials offer unique electrical properties, extraordinary strength and great efficiency in heat conduction....

• TCi’s Application in the Thermal Conductivity Characterization of Metal Hydrides

  The storage of hydrogen and the development of fuel cells are one of the main issues for the development of renewable energies in the next few years.

  Metal hydrides specifically are receiving...

• TCi’s Application in the Thermal Conductivity Characterization of Explosives

  Testing the thermal conductivity of most energetic materials is a challenge with more traditional techniques, as the required large volumes of material pose undesirable safety risks or the...

• Thermal Conductivity of Polyurethane Composites with Silver Nano- and Micro-Particles

  Polyurethanes are one of the most versatile plastics today. Typical applications range from flexible and rigid foams to thermoplastics used in medical devices, footwear, coatings, adhesives,...

• Thermal Conductivity of Diamond-Loaded Glues for the ATLAS Particle Physics Detector

  The ATLAS experiment is one of four large general-purpose particle detectors at the Large Hadron Collider (LHC) at the CERN laboratory in Geneva, Switzerland. ATLAS has been collecting data from...

• Thermal Conductivity of Magnesium Hydrides

  Magnesium has a high hydrogen storage capacity but its temperature of operation is too high and the hydrogen sorption kinetics too slow for practical applications. These two aspects have been...

• Introduction to the TCi: Explaining the Modified Transient Plane Source Technique

  Learn about the basics of operation to the C-Therm TCi Thermal Conductivity Analyzer. This webinar provides an excellent introduction in understanding the capabilities and limitations of the...

• TCi Application Focus:  Rock On!  Characterization of Rock and Soil Sediment (Geology)

  This webinar is the first in our  Spring "application focus" series of webinars in highlighting in greater detail some of the more popular fields of applicaiton for the innovative MTPS technique in...

• TCi Application Focus:  Hit the Road - Characterization of Asphalt & Concretes slides

  Similar to the above title, this webinar is the second in our Spring "application focus" series of webinars in highlighting in greater detail some of the more popular fields of application for the...

• Three Dimensional Homogeneity Characterization in Composite Materials

  Fiber reinforcement has revolutionized the applications of plastics. The introduction of fibers improves the mechanical properties over the base resin, producing engineering materials with a wide...

• Measuring Concentrations

  The Mathis Technology measures effusivity, the combination of thermal conductivity, density and heat capacity. The measurement is sensitive to all three properties and makes it an excellent tool to...

• Testing Minerals in Process

  The Mathis Technology has successfully been used to test granular minerals during processing. One application evaluated the percent removal of oil from Kuwaiti sand (see figures below). Another...

• Thermal Properties of Vacuum Insulation Panels

  Appliance manufacturing is progressing towards the use of vacuum insulation panels to increase energy efficiency. These panels are manufactured as a combination of a foam core of polyurethane or...

• Interfacial Heat Reflectance Technique for Thermal Management Design

  An interfacial technique to measure thermal conductivity has been adapted in order to meet the requirements of developers of electronics packaging and interconnect materials. The transient...

• Thermal Conductivity of Thin Film Carbon Fiber Die Attach

  Improving integrated circuit (IC) performance generally requires increased power density, thus generating more heat. Die attach materials are often the critical limiting item in the heat flow path...

• Gen II TCi Sensor

  The global leader in non-destructive thermal conductivity testing solutions has recently advanced its TCi Thermal Conductivity Analyzer with the release of its Gen II sensors offering users greater...

• Measuring Thermal Conductivity of Ceramics

  A recent development of the modified transient plane source (MTPS) technique offers an innovative solution to the traditional challenges of thermal conductivity measurement. Whether for development...

• Quality Control for Heat Sink Compounds and Gap Fillers

  Rapid Testing and sample size flexibility has made the Mathis thermal conductivity technology the only sensible choice for the quality control of thermal compounds such as heat sink compounds and...

• Quality Control for Automotive Interiors

  Measuring the comfort of interior materials has been difficult to quantify. With contact feel, insulating for temperature and sound as critical performance criteria, a method for accurately and...

• Orientation Specific Thermal Properties of Polyimide Film

  The present study examines the relationship between thermal conductivity and planarity in polyimide films. The samples tested were specially prepared to range in orientation from three...

• TCi Application: Concrete

  In a continuously improving and fast pace environment such as the concrete industry, there is always a need for reliable, rapid testing technique to ensure the uninterrupted working process....

• TCi Application: Asphalt

  The modern market of testing equipment provides new alternatives in choosing the most suitable and effective method to measure thermal properties of any material. C-Therm Technologies offers a new...

• Refractory Glass-Ceramics Based on Alkaline Earth Aluminosilicates

  Glass–ceramics that can be used at temperatures of 1200–1500 °C are found in the alkaline earth aluminosilicate field, and are generally nucleated internally with titania. These glass–ceramics have...

• Thermal Spectral and AFM Studies

  A non-ionic polymer (poly(vinyl alcohol) (PVA)) has been incorporated into the inorganic layers of calcium silicate hydrate (C–S–H) during precipitation of quasicrystalline C–S–H from aqueous...

• Characterization of TIMs

  The modified hot wire technique has been applied to evaluate consistency and homogeneity of thermal interface materials using measurements of thermal conductivity. A series of tests were conducted...

• Effects of Carbon Nanotubes on Properties of Poly Nanocomposites

  The C-Therm TCi Thermal Conductivity Analyzer is applied in characterizing the effects of surface-functionalized multi-walled carbon nanotubes (MWNTs) on the properties of poly(dimethyl siloxane)...

• Thermal Pentration Times as a Nondestructive Measure in Polyimide Film

  Material properties depend on their fabricated structure and orientation. It is thus important to develop rapid nondestructive techniques that will both allow determination of the orientation...

• Thermal Conductivity Technique Combines Transient and Non-destructive Benefits

  Thermal conductivity analysis and resultant data can be invaluable in helping to ensure consistent product quality. There are five main types of commercially available instruments to measure...

• Orientation and Position Dependant Thermal Conductivity

  Thermal conductivity is a critical thermophysical property to be monitored while manufacturing foam insulation for industries from construction to appliances. Formulators rely on lab based testing...

• Measure Thermal Properties of Liquids in Seconds

  The Mathis TC-30 is helping researchers accelerate the thermal characterization of liquids and pastes, as well as powders and solids. For process design, kinetic studies and liquid materials...

• Detection of Micro-Bubbles

  Advanced resin materials are used on submarines to reduce sound, acoustic signatures and vibration. In the manufacturing of the material, air can become entrapped causing the formation of...

• Do Not Equate Accuracy for Precision

  Good precision does not imply good accuracy, and good accuracy does not imply good precision. If different test methods each with excellent precision give significantly different results, neither...

• Implementation of Thermal QC Test for Vacuum Insulation Panels

  Thermal conductivity is a critical thermophysical property to be measured during the production of vacuum insulation panels (VIP). In the past quality control testing has been limited to guarded...

• Transient Thermal Conductivity Measurements

  Transient thermal conductivity methods have benefited from the rapid nature of the testing, but at the same time these methods are destructive because a sample must be prepared. Laser flash...

• Testing Fire Retardant Materials

  In the evaluation of new materials and additives for fire retardant applications, it is necessary to evaluate the material not only before but also after it is exposed to flame. Ideally, as burning...

• Thermal Management in Electronics

  Rapid testing and sample size flexibility makes the Mathis Technology the only choice for electronic components. Thermal conductivity is a key parameter to be evaluated in materials that are...

• Foam Capabilities

  The Mathis Technology is a sensitive instrument to evaluate the thermal conductivity of the material in contact with the sensor's heating element. The Mathis Technology sensor generates heat at the...

• Determination of Compression Affects on Thermal Conductivity in Installed Foam

  Compressible foam is used in a variety of comfort applications including use as a bedding and seating material. Density variations can occur in the foam initially, but this variation may be...

• Measurements in Motion

  Mathis Technology is a useful and effective instrument to determine blend uniformity of powders for pharmaceuticals, food and other industries. When powders are blended during production, timing is...

• Contact Resistance

  Contact resistance has received significant attention within discussions of thermal conductivity testing. Guarded hot plate techniques require that the temperature of the two plates are measured,...

• Determining Testing Depth

  When conducting testing with Mathis Technology, the heat wave penetrates into the sample. The depth of penetration increases with test time. It is often important to determine how far into the...

• Mixture Content Sensitivity

  The Mathis technology measures effusivity, the combination of thermal conductivity, density and heat capacity. The measurement is sensitive to all three properties and makes it an excellent tool to...

• Method for the Determination of Thermal Penetration

  A new method has been developed that determines the thermal penetration time (TPT). Materials can be tested nondestructively to yield TPT results within 5 minutes. This method is appropriate for...

• On-line SPC

  For certain applications, thermal conductivity is a desired parameter to monitor on-line, but until the Mathis Technology it has not been possible. The interfacial technique used by the Mathis...

• Testing Glass Filled Materials

  The Bayer Property Guide lists thermal conductivity, density and heat capacity for their Makrolon polycarbonate. These properties can be combined to give the Mathis Technology effusivity of (kρc_p)...

• Typical Excipient Effusivities

  Effusivities of various excipients are graphed below. Within each material, there may be large variations based on particle size distribution and mean, so these values are meant to be a guide...

• Flammability and Fire Protection

  The Pyris Mathis Technology measures effusivity, √(kρc_p) where k is thermal conductivity (W/m⋅K), ρ is density I(kg/m³) and c_p is specific heat capacity (J/kg⋅K). The term effusivity is referred to...

• Plant Implementation

  Mathis Technology can be used for quality checking of the end product. A number of stages are suggested below, which outline the basis of a successful Mathis Technology introduction into your...

• Kevlar Composite History

  The Mathis Technology is a useful tool for testing composite sheets to nondestructively evaluate their processing temperature history. Five Kevlar /resin composite plates were evaluated for a...

• Testing Brake Pads

  The sample size flexibility of the Mathis Technology makes it the only choice for brake pads. Thermal conductivity is a key parameter to be evaluated in this product, to design for optimum heat...

• Testing Appliances for Insulation Quality

  Thermal conductivity, heat capacity and density are key properties of polyurethane, to be monitored as part of a complete quality control program for the manufacturing of most appliances. These...

• Testing Materials under Vacuum

  The Mathis Technology technique offers the only method available today to test vacuum-sealed materials. The Mathis Technology rapidly measures thermal conductivity, density and heat capacity...

• Testing Curves and Insulated Pipe

  With the Mathis Technology users can measure thermal conductivity of a material with a minimum flat surface area of 5mm x 25mm. This has spawned the question “Can the Mathis Technology be used for...

• Non-destructive On-Line Evaluation of Polyurethane Foam in Appliances

  Thermal conductivity, heat capacity and density are key properties of polyurethane (PU) foam to be monitored as part of a complete quality control program for the manufacturing of most appliances....

• Three-way Thermal Conductivity Instrument Comparison

  Three thermal conductivity techniques have been compared on polyurethane foam: guarded hot plate (GHP),
  transient plane source (TPS) and modified hot wire (MHW). Trends and technique differences...

• Determining the Test Pressure

  With many applications the magnitude of thermal conductivity or effusivity is a function of pressure. This is true for example of compressible fabrics, electronic gap filling interface materials,...

• Optimization Technique For Evaluation of Vacuum Insulation Panels

  Thermal conductivity is a critical thermophysical property to be measured during the production of vacuum insulation panels. In the past quality control testing has been limited to guarded hot...

• Resin Cure Monitoring Using Thermal Conductivity Measurements

  The use of thermal conductivity measurements as a non-destructive technique for monitoring the extent of curing in a room temperature cure epoxy resin has been investigated. Three-point bending...

• Nondestructive Detection of Heat Damage

  The present study examined the relationship between the thermal properties and the degree of heat damage in carbon – carbon composites. The results show that as the degree of heat damage increased...

• History of Trends in Oriented Polymers

  The TC Probe measures thermal conductivity based on heat transfer principles and uses a modified hot wire approach. Measurements are non destructive, have flexible sample sizes and have test times...

• Orientation and Strength Correlations

  Currently in the polymer processing industry, attention is being focused on the optimisation and then monitoring of manufacturing parameters to ensure product specifications are met. This involves...

• TC Probe Application Boiler Tube Slag Measurements

  The TC Probe measures thermal conductivity based on heat transfer principles and uses a modified hot wire approach. Measurements are non destructive, have flexible sample sizes and have test times...

• Testing Ceramics

  Ceramics are used as refractory materials in boilers and furnaces. When these ceramics are in the form of fibrous bundles, the effective thermal conductivity is related to the compression during...

• Thermal Conductivity: A New Tool in the Thermal Analysis Arsenal

  Thermal conductivity, k, is a key property in materials that are used in thermal management. Materials such as home and appliance insulation need low k where materials involved in dissipating heat...

• Influence of Particle Size

  Effusivity of a powder varies from 200 – 800 Ws^1/2/m²K compared to air at 5. As a result, effusivity varies significantly with particle size. The smaller the particles, the better they pack and the...

• Testing Through Skins

  The Mathis Technology is a sensitive instrument to evaluate the thermal conductivity of the material in contact with the sensor's heating element. The Mathis Technology heat wave penetrates less...

• Thermal Conductivity Homogeneity and Topography Characterization

  Thermal conductivity is a key parameter for evaluating materials involved in thermal management. Thermal conductivity is a consideration at all levels when thermal engineers design for optimum heat...

• Thermal Conductivity: Moving from the Lab to the Line

  Thermal conductivity is a critical thermo-physical property to be measured while manufacturing products such as building materials, appliances, electronics, plastics and foams. Formulators rely on...

• Dispersion and Thermal Conductivity of Carbon Nanotube Composites

  A mechanical method was used to shorten carbon nanotubes (CNTs) for improving dispersion without reducing their thermal conductivity. Single walled carbon nanotubes (SWCNTs) were mechanically cut...

• Thermal Conductivity Measurement of Metal Hydrides

  There are extensive efforts underway worldwide to develop inexpensive and practical hydrogen storage materials for the implementation of a hydrogen-based energy economy. Metal hydrides are leading...

• Thermal Conductivity of Ammonium Nitrate

  In recent years, there have been numerous incidents involving runaway reactions with ammonium nitrate emulsion (ANE) explosives. In most cases, thermal explosions have occurred during abnormal...

• Thermal Conductivity of Thin Films

  The present study describes the use of the modified hot wire technique to measure the thermal conductivity of regular printing paper and conductive transfer film. Testing methods have been...

• Thermal Effusivity: Characterizing Gas Diffusion Electrodes

  Preliminary results for a new methodology of measuring porosity in gas diffusion electrodes are presented. A  rapid, non-destructive method to characterize composite materials processed in a film...

• Thermal Effusivity as a Possible Indicator of Particle Size and Particle Size Distribution

  Characterization of three chemically identical but physically different powder samples yielded unexpected but logical results. Thermal effusivity values appeared to correlate with particle size,...